enqert



(No Model.)

A. C. ENGERT.

STEAM BOILBR AND PURNAGB.

No. 281,852. Patented July 24, 1888.

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i VUnire TATES i PATENT Ottica.Y

ADAM CYRUS ENGERT, OF THREE MILLS LANE, COUNTY OF MIDDLESEX,

, ENGLAND.

STEAM BOILER AND FURNACE.

SPECIFICATION forming part of Letters Patent No. 281,852, dated July S4, 1883.

Application filed March E27, 1883. (No model.) Patented in England June 5, ISS;` No. $2,633.

A have received Letters Patent in Great Britain,

N o. 2,633, dated June 5, 1882,) o f which the following is a specification. s

Heretofore, in Cornish and other such like boilers with internal furnace-fines, the lines have usually been circular in cross-section, and of the same diameter from end to end, and the furnace has been contained within the front end of the flue. According to my invention I make the furnace-fine of nearly as great a width as the width of the boiler will allow, and comparatively shallow in depth. `At the front of the boiler I gradually increase the depth of this iiattened flue, making it bell-mouthed, to form the furnace-chamber or fire-box, which may extend forward to some distance in front of the boiler. The re bars or bed I make to slope downward toward the front and correspondingly with the downward slope of the bottom front end of the flattened flue, and at the front I bend them upward, or provide front bars toretain the fuel from dropping downward off the front Vof thel sloping` bars. The front of the re-box is closed in to the extent desired with a fixed box and with front fire-doors. The ordinary ashpit is practically done away with, as only sufficient space is left below the bars for the admission of A air to the furnace, while the ashes falling through the bars fall or can readily be withdrawn `away downward along the sloping bottom of the flue and drop down in front of the boiler. In a Cornish boiler I place the furnace-flue about midway between the top and bottom of the boiler, and below the furnaceflue Iprovide another flattened flue, passing horizontally through the boiler, to serve as a return-flue. In the setting of the boiler I connect the rear ends of these fines, so that the gases issuing from the rear end of the furnace-flue may pass back through the lower flue to the front of the Vfire-chamber.

ing through the boiler or to a brick-work flue below its bottom. The lower flue or fines of the boiler I make, like the f urnace-ilue, of about as great awidth as the width of the boiler will allow and of comparatively. small depth. lIhe boiler-fines are stayed with tubular vertical stays. In the case of boilers heated by external furnaces, the furnaces may be formed in the same way, with the bed sloping downward toward the front, and with the flue from the fire-place of small depth and considerable width, as above described.

Figure l of the drawings hereunto annexed shows a cross-section; Fig. 2, a longitudinal section, and Fig. 3, a plan View in seetion,and Fig. 4, a front View of a Cornish boiler and its furnace constructed according to my invention.

` A is the furnace-flue; B, the return-flue below it, and C a flue on the outside of the boiler, leading to the chimney.

D is the bell-mouthed end of the flue A, which at top is, as shown, made horizontal, or nearly so, while thebottom is made to slope downward. In front of this bell-mouthed end is secured a box, E, forming the front of the It is closed in at the front by doors F, shown at Figs. 2 and 4. Inside the door, and separated from it by short distancepieces, is a perforated baffle-plate, so that air entering through slots at the top and bottom ofthe door has to issue into the furnace through the holes in the baffle-plate, and thereby gets evenly distributed, and also heated as it passes to the fire. The bottom of the box E is open,

fto allow air to pass to the fire between the firebars. Slides are applied to the slots in the door, so that more or less air can be allowed to enter through them. This allows of more air being admitted into the furnace after ring, for the more complete combustion of the gases then driven off from the newly-introduced fuel. One door only should be opened at a time when fresh fuel is put on. The heat from the other half of the fire is then so great that the incoming air will be sufficiently heated to cause it at once to enter into combustion with the gases it meets with.

G are the fire-bars.

G is a dead-plate at the back end of the bars, or no dead-plate might be used and the bars made to extend the whole length. The bars G IOO run lengthwise of the boiler and slope downward toward the front. Their front ends are bent upward,.as shown at Fig. 2, to retain the fuel and prevent its dropping off from the bars when the doorV is opened.

The fiues A and B are, as shown, stayed with numerous vertical tubular stays. These, as they stand across the flues, retard the passage of the heated gases from the fire, and the gases' curl around and effectually heat them, and as they become heated they cause a brisk circulation of the water in the boiler and keep it in agitation, thereby preventing the accumulation of deposit on the tops of the flues or at the bottom of the boiler. The two flattened fines A and B occupy less space in the boiler than the two ilues of an ordinary Lancashire boiler, and the crown of the top fine is not so high as the crowns of the ordinary iiues, and there is therefore less risk of the water-level getting below the crown, and therefore there is less risk of danger from this cause.

lis a feed-water heater forming the top of the short flue, which connects the back end of the iiue A with the back end of the flue B. J is a water -tank from which the feed -water heater is supplied with water. K is an air and steam pipe from the feed-water heater. Any water carried upward through this pipe is, as shown, returned to the water-supply tank.

L is an iron easing at the front of the boiler, serving to connect the front of the flue B with the front entrance to the flue C.

The steam-boilers of locomotive-engines may advantageously be constructed in the manner hcreinbefore described.

Vhen the re is to be fed with fuel, the fire is raked forward and the fresh fuel thrown onto nace hereinbefore mentioned might also be formed in the manner described-that is, with fire-bars sloping downward toward the front, with the exit for the ames at a point above the top of the bars, so that the iiames and heated gases arising from the front of the fire may the better sweep over theA surface of the fuel at the back of the bars and promote its combustion.

Having thus described the nature of my invention and the manner of performing the same, I would have tunderstood that I claiml. rlhe combination of the flattened iue having the bottom of its front end or mouth sloped downwardly, and the correspondingly-sloping fire bars or bed in the mouth of the flue, near the bottom thereof, and bent upward at front, substantially as and for the purpose hereinbefore set forth.

2. The combination, in a steam-boiler, of the internal flattened bell-mouthed flue, A,thc iirebars in the mouth of said flue, and the flattened return-flue communicating with the flue leading to the chimney7 substantially as and for the purpose hereinbefore set forth.

ADAM GYRUS ENGERT.

Vitnesses:

GEO. J. VB. FRANKLIN, JNO. DEAN, Bot/lief 17 Gmcccl/mchStreet, Loudon, E. C. 

